1z0-053.actuatest.9-16-2012
.pdfB.Recommending optimization of materialized views
C.Checking query objects for missing and stale statistics
D.Recommending bitmap, function-based, and B-tree indexes
E.Recommending restructuring SQL queries that are using bad plans
Answer: ACE
Section: (none)
Explanation/Reference:
Explanation:
SQL Tuning Advisor Automatic SQL tuning is exposed through SQL Tuning Advisor. SQL Tuning Advisor runs automatically during system maintenance windows as a maintenance task. During each automatic run, the advisor selects high-load SQL queries in the database and generates recommendations for tuning these queries.
SQL Tuning Advisor recommendations fall into the following categories:
-Statistics analysis
-SQL profiling
-Access path analysis
-SQL structure analysis
A SQL Profile contains additional statistics specific to a SQL statement and enables the optimizer to generate a better execution plan. Essentially, a SQL profile is a method for analyzing a query. Both access path and SQL structure analysis are useful for tuning an application under development or a homegrown production application.
A principal benefit of SQL Tuning Advisor is that solutions come from the optimizer rather than external tools (see "Overview of the Optimizer" on page 7-10). Thus, tuning is performed by the database component that is responsible for the execution plans and SQL performance. The tuning Oracle 1z0-053 Exam
process can consider past execution statistics of a SQL statement and customizes the optimizer settings for this statement.
http://www.remote-dba.net/oracle_10g_new_features/tuning_advisor.htm How the SQL Tuning Advisor Works: The optimizer will work in the new tuning mode wherein it conducts an in-depth analysis to come up with a set of recommendations, the rationale for them and the expected benefit if you follow the recommendations.
When working in tuning mode, the optimizer is referred to as the Automatic Tuning Optimizer (ATO).
QUESTION 644
In your production database, users report that they are unable to generate reports on an important table because it does not contain any data. While investigating the reason, you realize that another user executed the TRUNCATE TABLE command, which accidentally caused the data to be lost. Now you want to recover the lost data of the table without affecting objects in other schemas.
Which method must you use to recover the lost data?
A.Complete Recovery with online redo log
B.Complete Recovery with archived redo log
C.Tablespace Point-in-Time Recovery (TSPITR)
D.Incomplete Recovery with system change number (SCN)
Answer: C
Section: (none)
Explanation/Reference:
Explanation:
RMAN TSPITR is most useful for the following situations:
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- You want to recover data lost after DDL operations that change the structure of tables. You cannot use Flashback Table to rewind a table to before the point of a structural change such as a truncate table operation.
QUESTION 645
View the Exhibit.
You are creating a database by using Database Configuration Assistant (DBCA). You have chosen the File System option as the storage mechanism. What would be the result of choosing this option?
Exhibit:
Oracle 1z0-053 Exam
A.Disk mirroring and striping would be done automatically
B.The database files would be managed by the operating system's file system
C.DBCA would not save the database files by using Optimal File Architecture (OFA)
D.The data files are automatically spread across all available storage devices to optimize performance and resource utilization
Answer: B
Section: (none)
Explanation/Reference:
Explanation:
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QUESTION 646
View the Exhibit and examine the disk groups created at the time of migrating the database storage to Automatic Storage Management (ASM).
Why does the FRA disk group initially have more free space even though both DATA and FRA disk groups are provided with the same size?
A.Because the FRA disk group will not support dynamic rebalancing
B.Because the FRA disk group is not configured to support mirroring
C.Because disks in the FRA disk group are not formatted at this stage
D.Because the FRA disk group will support only a single size of allocation unit
Answer: B
Section: (none)
Explanation/Reference:
Explanation:
Oracle 1z0-053 Exam
QUESTION 647
Which two statements are true about a job chain? (Choose two.)
A.A job chain can contain a nested chain of jobs.
B.The jobs in a job chain cannot have more than one dependency.
C.A job of the CHAIN type can be run using event-based or time-based schedules.
D.The jobs in a job chain can be executed only by using the events generated by the Scheduler
Answer: AC
Section: (none)
Explanation/Reference:
Explanation:
QUESTION 648
View the exhibit and examine the TRANS table's storage information.
After a massive delete operation, you executed the following statement to shrink the TRANS table: SQL> ALTER TABLE trans SHRINK SPACE CASCADE;
Which statement describes the outcome of the command?
Exhibit:
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A.An error is produced.
B.The table and all related objects are compacted and the position of the high-water mark (HWM) for the table is adjusted
C.The table and related indexes are compacted but the position of the high-water mark (HWM) for the table remains unchanged
D.The unused space in the table is reclaimed and returned to the tablespace and the data manipulation language (DML) triggers on the table are fired during the shrinking process
Answer: B
Section: (none)
Explanation/Reference:
Explanation: Exhibit Reference: CASCADE:
If you specify CASCADE, then Oracle Database performs the same operations on all dependent objects of table, including secondary indexes on index-organized tables. The CASCADE clause Oracle 1z0-053 Exam
extends the segment shrink operation to all dependent segments of the object. For example, if you specify CASCADE when shrinking a table segment, all indexes of the table will also be shrunk. (You need not specify CASCADE to shrink the partitions of a partitioned table.) To see a list of dependent segments of a given object, you can run the OBJECT_DEPENDENT_SEGMENTS procedure of the DBMS_SPACE package.
QUESTION 649
You executed the following commands in a database session:
What could have caused the recycle bin to clean up?
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A.There is demand for space from the new table
B.The undo tablespace does not have sufficient free space
C.The new table name is the same as the table name in the recycle bin
D.The temporary tablespace that is assigned to you does not have sufficient free space
Answer: A
Section: (none)
Explanation/Reference:
Explanation: http://download.oracle.com/docs/cd/B19306_01/backup.102/b14192/flashptr004.htm#i1019426 Recycle Bin Capacity and Space Pressure
There is no fixed amount of space preallocated for the recycle bin. Therefore, there is no guaranteed minimum amount of time during which a dropped object will remain in the recycle bin. The rules that govern how long an object is retained in the recycle bin and how and when space is reclaimed are explained in this section.
QUESTION 650
Note the following statements that use flashback technology:
1.FLASHBACK TABLE <table> TO SCN <scn>; Oracle 1z0-053 Exam
2.SELECT * FROM <table> AS OF SCN 123456;
3.FLASHBACK TABLE <table> TO BEFORE DROP;
4.FLASHBACK DATABASE TO TIMESTAMP <timestamp>;
5.SELECT * FROM <table> VERSIONS AS OF SCN 123456 AND 123999;
Which of these statements will be dependent on the availability of relevant undo data in the undo segment?
A.1, 2, and 5
B.1, 3, and 4
C.2, 3, 4, and 5
D.1, 2, 3, 4, and 5
Answer: A
Section: (none)
Explanation/Reference:
Explanation:
QUESTION 651
Examine the CREATE DISKGROUP command used to create a disk group:
SQL> CREATE DISKGROUP misc EXTERNAL REDUNDANCY
DISK 'ORCL: FRA3' NAME misc1, 'ORCL: FRA4' NAME misc2;
In which situation would you use this method of disk group creation?
A. When two-way disk mirroring is required for the allocation units
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B.When three-way disk mirroring is required for the allocation units
C.When using hardware mirroring or RAID
D.When disk mirroring is required for the Automatic Storage Management (ASM) disks
Answer: C
Section: (none)
Explanation/Reference:
Explanation:
QUESTION 652
Which three tasks can be performed using a duplicate database? (Choose three.)
A.Testing the backup and recovery procedures Oracle 1z0-053 Exam
B.Testing the upgrade of an Oracle database to a new release
C.Testing the effect of an application changes on database performance
D.Continuously updating archive log files from the target database to support failover
Answer: ABC
Section: (none)
Explanation/Reference:
Explanation:
QUESTION 653
The user SYS creates a job by using the following command:
Which two statements are true about the job that was created by the preceding command? (Choose two.)
A.The job is enabled by default after creation
B.The job is automatically dropped after the end date
C.The job executes with the privileges of the user SYS
D.The globalization environment that exists at the time of the job creation prevails at the job runs
Answer: BC
Section: (none)
Explanation/Reference:
Explanation:
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QUESTION 654
Tape streaming is not happening while performing RMAN tape backup. On investigation, you find that it is not because of the incremental backup or the empty file backup and that RMAN is sending data blocks to the tape drive fast enough.
What could be a solution to make tape streaming happen during the backup?
A.Configure backup optimization
B.Configure the channel to increase MAXOPENFILES
C.Configure the channel to increase the capacity with the RATE parameter Oracle 1z0-053 Exam
D.Configure the channel to adjust the tape buffer size with the BLKSIZE option
Answer: C
Section: (none)
Explanation/Reference:
Explanation:
In the ALLOCATE or CONFIGURE CHANNEL commands, the RATE parameter specifies the bytes/ second that are read on a channel. You can use this parameter to set an upper limit for bytes read so that RMAN does not consume excessive disk bandwidth and degrade online performance. Essentially, RATE serves as a backup throttle. For example, if you set RATE 1500K, and if each disk drive delivers 3 MB/ second, then the channel leaves some disk bandwidth available to the online system.
QUESTION 655
Which two operations are NOT performed by the DUPLICATE command in Recovery Manager (RMAN) while duplicating a running database? (Choose Two)
A.Creating the control file for the duplicate database
B.Restoring the target data files to the duplicate database
C.Performing complete recovery using all available backups
D.Generating a new, unique DBID for the duplicate database
E.Copying the online redo log files from the target database to the duplicate database
Answer: CE
Section: (none)
Explanation/Reference:
Explanation:
QUESTION 656
You are using Recovery Manager (RMAN) with a recovery catalog to back up your production database. The backups and the archived redo log files are copied to a tape drive on a daily basis. Because of media failure, you lost your production database completely along with the recovery catalog database. You want to recover the target database and make it functional. You consider performing the following steps to accomplish the task:
1)Restore an autobackup of the server parameter file.
2)Restore the control file
3)Start the target database instance
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4)Mount the database
5)Restore the data files Oracle 1z0-053 Exam
6)Open the database with RESETLOGS option
7)Recover the data files
8)Set DBID for the target database
Which option illustrates the correct sequence that you must use?
A.8, 1, 3, 2, 4, 5, 7, 6
B.1, 8, 3, 4, 2, 5, 7, 6
C.1, 3, 4, 2, 8, 5, 6, 7
D.1, 3, 2, 4, 6, 5, 7, 8
Answer: A
Section: (none)
Explanation/Reference:
Explanation:
w/o recovery catalog, you must provide dbid for rman to search for spfile autobackup.
QUESTION 657
Examine the following ALTER command:
SQL> ALTER DISKGROUP dgroup1 UNDROP DISKS;
What is the purpose of the command?
A.It cancels all pending disk drops within the disk group.
B.It restores disks that are being dropped as the result of a DROP DISKGROUP operation
C.It mounts disks in the disk group for which the drop-disk operation has already been co pleted
D.It restores all the dropped disks in the disk group for which the drop-disk operation has already been completed
E.It adds previously dropped disks back into the disk group
Answer: A
Section: (none)
Explanation/Reference:
Explanation:
The UNDROP DISKS clause of the ALTER DISKGROUP statement allows pending disk drops to be undone. It will not revert drops that have completed, or disk drops associated with the dropping of a disk group.
QUESTION 658
Oracle 1z0-053 Exam
The BACKUP_TAPE_IO_SLAVES parameter is set to FALSE for the database instance. Which statement is true while performing a tape backup in an RMAN session?
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A.The tape I/O performed is asynchronous
B.The tape buffer is allocated from the System Global Area (SGA)
C.The tape buffer is allocated from the Program Global Area (PGA)
D.Oracle I/O uses an interrupt mechanism to determine when each I/O completes
Answer: C
Section: Backup, Recovery & Recovery Manager (RMAN)
Explanation/Reference:
Explanation:
Section: Backup, Recovery & Recovery Manager (RMAN)
http://download.oracle.com/docs/cd/B10501_01/server.920/a96566/rcmtunin.htm#449408 RMAN allocates the tape buffers in the SGA or the PGA, depending on whether I/O slaves are used. If you set the initialization parameter BACKUP_TAPE_IO_SLAVES = true, then RMAN allocates tape buffers from the SGA or the large pool if the LARGE_POOL_SIZE initialization parameter is set. If you set the parameter to false, then RMAN allocates the buffers from the PGA.
QUESTION 659
The database is currently open and the temp03.dbf tempfile belonging to the default temporary tablespace TEMP has been corrupted. What steps should you take to recover from this tempfile loss in an efficient manner?
A.Allow the database to continue running, drop the TEMP tablespace, and then re-create it with new tempfiles
B.Shut down the database, restore and recover the tempfile from backup, and then open the database with RESETLOGS
C.Allow the database to continue running, take the TEMP tablespace offline, drop the missing tempfile, and then create a new tempfile
D.Allow the database to continue running, add a new tempfile to TEMP tablespace with a new name, and drop the tempfile that has been corrupted.
Answer: D
Section: (none)
Explanation/Reference:
Explanation:
QUESTION 660
Indentify two advantages of using recovery catalog instead of the control file of the database in Recovery Manager (RMAN). (Choose two.)
Oracle 1z0-053 Exam
A.You can use RMAN stored scripts
B.Recovery is faster if data is stored in catalog in addition to the control file
C.You can store backup information of all registered databases in one place
D.Database backups are automatically deleted when they are older than the specified time period
Answer: AC
Section: (none)
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Explanation/Reference:
Explanation:
QUESTION 661
Which two commands never trigger an implicit rebalancing within the disk group?. (Choose two.)
A.ALTER DISKGROUP misc MOUNT;
B.ALTER DISKGROUP misc DROP DISK misc2;
C.ALTER DISKGROUP misc CHECK ALL NOREPAIR;
D.ALTER DISKGROUP misc RESIZE ALL SIZE 1023m;
E.ALTER DISKGROUP dgroupA ADD DISK '/devices/A*';
Answer: AC
Section: (none)
Explanation/Reference:
Explanation:
QUESTION 662
You want to configure the Flashback Database feature and retain flashback logs for three days. Presently the database is open and configured in ARCHIVELOG mode.
The following steps must be performed in the correct sequence to do this:
1. Set the retention target:
SQL> ALTER SYSTEM SET DB_FLASHBACK_RETENTION_TARGET=4320;
2. Enable Flashback Database:
SQL> ALTER DATABASE FLASHBACK ON;
3. Mount the database:
SQL> STARTUP MOUNT EXCLUSIVE
4. Shutdown the instance:
SQL> SHUTDOWN IMMEDIATE
5. Open the database: Oracle 1z0-053 Exam
SQL> ALTER DATABASE OPEN;
Choose the correct sequence.
A.4, 1, 3, 2, 5
B.4, 3, 1, 2, 5
C.2, 4, 3, 5, 1
D.4, 2, 5, 3, 1
Answer: B
Section: (none)
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